iPhone: Your fingertips control everything, even zooming in and out of screens.
The Competition: Touch screens have been available on handhelds since the 1990s, but their performance with fingers hasn't been great. That's why the Nokia N800 Internet Tablet automatically resizes its on-screen keyboard when used by stubby fingers instead of a stylus, and HP's new iPaq 500 Smartphone uses voice commands, betting that's the interface of the future.
